Large Flooding Event in a Large Region Including Chicago

Chicago has received near-record rainfall totals. The area affected by sudden floods stretches from at least St. Louis to Michigan. Jeff Masters has some of the details:

Torrential downpours from endless thunderstorms fed by an atmospheric river of moisture have pounded the Chicago area since noon Wednesday, forcing declaration of a flash flood emergency in the city this morning. Four to six inches of rain has fallen in the past 24 hours over most of Northern Illinois, with more than half of that total falling since midnight in many areas. Chicago’s Ohare Airport received 5.85″ as of 10 am CDT, and the 3.84″ of rain that has fallen so far today is the heaviest rain ever recorded in a calendar day in the Windy City so early in the year. Radar-estimated rainfall amounts in excess of 8″ have occurred in areas of Northwest Illinois about 150 miles east of Chicago. Chicago’s all-time 24-hour rainfall record is 9.35″, set August 13 – 14, 1987. Another 1 – 2″ of rain is likely today in the city.

(Um, Jeff, noplace in Illinois is east of Chicago. I think you mean Northwest Indiana.)

Here’s accumulated 24-hour rainfall thorugh 7 AM yesterday.

Much of Northern Illinois saw a 40-year recurrence event. On the western edge of the event, parts of the Mississippi River are experiencing major flooding, a year after the river almost ran dry.

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